Erie weather in September: Erie, Pennsylvania: normal highs, lows, rain and records for September
Erie in September has a normal high of 74°F and a normal low of 57°F, a daily mean of 65°F, falling from 78°F on the 1st to 69°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 4.32 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 14°C, 110 mm of precipitation in September.
- NOAA stationErie International Airport
- Station IDUSW00014860
- Location42.08°N 80.18°W
- Elevation730 ft (223 m)
- From the center6 miles
- Population92,940
- Jan 35° 21°
- Feb 37° 21°
- Mar 44° 28°
- Apr 57° 38°
- May 68° 49°
- Jun 77° 59°
- Jul 81° 64°
- Aug 80° 63°
- Sep 74° 57°
- Oct 62° 46°
- Nov 51° 37°
- Dec 40° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Erie in September?
The normal high is 74°F and the normal low 57°F, for a daily mean of 65.2°F. September is 6.3°F cooler than August and 10.9°F warmer than October. September is the 4th warmest month of the year in Erie and the 2nd wettest. Across the month the normal high falls 9°F, from 78°F on September 1 to 69°F on September 30. From one year to the next September's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 63°F and 68°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 40%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 78°F | 61°F | 31% | 20% |
| September 8 | 76°F | 59°F | 32% | 22% |
| September 15 | 74°F | 57°F | 34% | 24% |
| September 22 | 72°F | 55°F | 36% | 26% |
| September 30 | 69°F | 52°F | 40% | 28% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 78°F | 61°F | 31% | 20% | 13 h 10 min |
| September 2 | 78°F | 61°F | 31% | 21% | 13 h 10 min |
| September 3 | 78°F | 61°F | 31% | 21% | 13 h 10 min |
| September 4 | 77°F | 60°F | 32% | 21% | 13 h |
| September 5 | 77°F | 60°F | 32% | 21% | 13 h |
| September 6 | 77°F | 60°F | 32% | 21% | 13 h |
| September 7 | 77°F | 60°F | 32% | 22% | 13 h |
| September 8 | 76°F | 59°F | 32% | 22% | 12 h 50 min |
| September 9 | 76°F | 59°F | 33% | 22% | 12 h 50 min |
| September 10 | 76°F | 59°F | 33% | 22% | 12 h 50 min |
| September 11 | 75°F | 58°F | 33% | 23% | 12 h 40 min |
| September 12 | 75°F | 58°F | 33% | 23% | 12 h 40 min |
| September 13 | 75°F | 58°F | 34% | 23% | 12 h 40 min |
| September 14 | 75°F | 57°F | 34% | 23% | 12 h 40 min |
| September 15 | 74°F | 57°F | 34% | 24% | 12 h 30 min |
| September 16 | 74°F | 57°F | 34% | 24% | 12 h 30 min |
| September 17 | 73°F | 56°F | 34% | 24% | 12 h 30 min |
| September 18 | 73°F | 56°F | 35% | 24% | 12 h 20 min |
| September 19 | 73°F | 56°F | 35% | 25% | 12 h 20 min |
| September 20 | 72°F | 55°F | 36% | 25% | 12 h 20 min |
| September 21 | 72°F | 55°F | 36% | 25% | 12 h 20 min |
| September 22 | 72°F | 55°F | 36% | 26% | 12 h 10 min |
| September 23 | 71°F | 54°F | 37% | 26% | 12 h 10 min |
| September 24 | 71°F | 54°F | 37% | 26% | 12 h 10 min |
| September 25 | 71°F | 54°F | 38% | 26% | 12 h 10 min |
| September 26 | 70°F | 53°F | 38% | 27% | 12 h |
| September 27 | 70°F | 53°F | 39% | 27% | 12 h |
| September 28 | 69°F | 53°F | 39% | 27% | 12 h |
| September 29 | 69°F | 52°F | 40% | 28% | 11 h 50 min |
| September 30 | 69°F | 52°F | 40% | 28% | 11 h 50 min |
- Normal high
- 74°FSeptember average
- Normal low
- 57°FSeptember average
- Precipitation
- 4.32 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 20
- Days at 80°F or more
- 6
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014860; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Erie in September?
On a given September day the chance of 0.01 inch or more is 35% on average, highest around September 30 (40%). In all, 4.32 in falls on 10 days of a normal September, 1 of them with an inch or more.
In a normal September in Erie, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014860.
How humid and windy is Erie in September?
At 3 p.m. the normal temperature is 65°F with 60% relative humidity and a dew point of 51°F; at 6 a.m. it is 55°F with 79% humidity. The wind averages 9.4 mph, most often from the west in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 55°F | 48°F | 79% | 8.8 mph | 49% |
| 9 a.m. | 60°F | 50°F | 70% | 10.1 mph | 53% |
| noon | 64°F | 51°F | 61% | 11.1 mph | 50% |
| 3 p.m. | 65°F | 51°F | 60% | 10.8 mph | 53% |
| 6 p.m. | 62°F | 51°F | 66% | 7.9 mph | 57% |
| 9 p.m. | 58°F | 50°F | 75% | 8.2 mph | 58% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014860. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Erie?
The warmest September temperature on Erie's official record (since 1873) is 99°F, on September 3, 1953; the coldest is 33°F, on September 27, 1957. The wettest September brought 10.65 in (1977).
The September mean against the 1991-2020 normal of 65.2°F: 2021 67.6°F (+2.4), 2022 64.3°F (−1.0), 2023 66.0°F (+0.8), 2024 68.6°F (+3.4), 2025 64.8°F (−0.4), 2026 66.3°F (+1.0). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 67.6°F | +2.4°F | 3.55 in |
| 2022 | 64.3°F | −1.0°F | 8.31 in |
| 2023 | 66.0°F | +0.8°F | 1.88 in |
| 2024 | 68.6°F | +3.4°F | 1.70 in |
| 2025 | 64.8°F | −0.4°F | 1.92 in |
| 2026 | 66.3°F | +1.0°F | 5.63 in |
Source: records: ACIS, NWS threaded record ERIthr; recent months: ACIS, station USW00014860. Records and recent months use complete months only.
How does September in Erie compare across Pennsylvania?
Across the 108 places PlainClimate covers in Pennsylvania, September normal highs run from 68°F in Laporte to 80°F in Marcus Hook; Erie's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.